Hello

Leo from TURBINE KREUZBERG

Serverless Framework

• CLI tool
• configure your (AWS) app in a .yml file
  permissions, resources, functions, routes, events
• deploy your app to FaaS provider
• invoke functions local
• ...

You need

• nodejs v6.5.0+
• Serverless CLI v1.9.0+
  

  npm install -g serverless

• FaaS provider account
• set up provider credentials

key concepts

• functions
• events
• resources
• plugins

serverless.yml

service: my-app

provider:
  name: aws
  runtime: nodejs6.10
  stage: dev
  region: eu-central-1

functions:
  homePage:
    handler: src/homePage.handler
    events:
      - http: 'GET /'

deploy my app

$ sls deploy
Serverless: Packaging service...
Serverless: Excluding development dependencies...

(...)

endpoints:
  GET - https://abcdefghij.execute-api.eu-central-1.amazonaws.com/dev
functions:
  homePage: my-app-dev-homePage
        

src/homePage.js

'use strict';

module.exports.handler = (event, context, callback) => {
  const response = {
    statusCode: 200,
    body: JSON.stringify({
      message: 'Welcome to my website',
      input: event,
    }),
  };

  callback(null, response);
};

change, log, deploy, run

$ sls log -f homePage -t
$ sls deploy -f homePage
$ sls invoke -f homePage
        

permissions

service: my-app

provider:
  ...
  environment:
    DYNAMODB_LOG_TABLE: ${self:service}-request-log-${self:provider.stage}
  iamRoleStatements:
    - Effect: Allow
      Action:
        - dynamodb:Query
        - dynamodb:Scan
        - dynamodb:PutItem
      Resource: "arn:aws:dynamodb:${self:provider.region}:*:table/${self:provider.environment.DYNAMODB_LOG_TABLE}"
...

Add Resource Table

resources:
  Resources:
    RequestLogDynamoDbTable:
      Type: 'AWS::DynamoDB::Table'
      Properties:
        AttributeDefinitions:
          -
            AttributeName: id
            AttributeType: S
        KeySchema:
          -
            AttributeName: id
            KeyType: HASH
        ProvisionedThroughput:
          ReadCapacityUnits: 1
          WriteCapacityUnits: 1
        TableName: ${self:provider.environment.DYNAMODB_LOG_TABLE}
        

src/homePage.js

const uuid = require('uuid');
const aws = require('aws-sdk');
const dynamoDb = new aws.DynamoDB.DocumentClient();

module.exports.handler = (event, context, callback) => {

  ...

  const params = {
    TableName: process.env.DYNAMODB_LOG_TABLE,
    Item: {
      id: uuid.v1(),
      function: 'homePage.handler',
      requestTime: new Date().getTime()
    },
  };

  dynamoDb.put(params, (error) => {
    if(error) {
      // we should to some error handling ...
      console.log(error);
    }
    callback(null, response);
  }
};

Events

• assign multiple events to single function
• S3, DynamoDb, API gateway, schedule, SNS, AlexaSkill, IoT
• CloudWatch Events and Logs

Resources

• write raw template syntax

logging

sls logs -f myFunction -t

• creates a LogGroup for every function
• tags in serverless.yml for functions

deployment

• set global environment variables and override them in functions
• automated versioning
• deploy to different stages or regions
• deploy whole app
• deploy single functions

failure

• DQL support for every functions

kickstart

$ sls create --template aws-nodejs --path my-app     # create
$ sls deploy -v                        # deploy app
$ sls deploy function -f my-function   # deploy single function
$ sls invoke -f my-function -l         # run single function
$ sls logs -f hello -t                 # like tail -f your.log
$ sls remove                           # remove your service :(
					

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